| 摘要 |
PROBLEM TO BE SOLVED: To improve a production efficiency in mounting components on printed wiring boards and improve a yield of the printed wiring boards mounted with components. SOLUTION: A pair of printed wiring boards 10 are set on a product sheet 20, and the product sheet 20 is transferred to a step of mounting components relative to the printed wiring boards 10. The sides of the product sheet 20 are cut off in correspondence with the side shape of each printed wiring board 10 set on the product sheet 20, and the product sheet 20 is successively provided with a side edge protruding part 24, a recessed part 21, a central protruding part 23 and a cut-off part 22. A pair of product sheets 20 whose sides are opposed to each other are engaged with each other under the condition that the central protruding part 23 and the side edge protruding part 24 of one of the product sheets 20 are respectively inserted into the recessed part 21 and the cut-off part 22 of the other product sheet 20.
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